Structural,morphological and photoluminescence characterizations of Sm^(3+) doped Y_(2)O_(3) nano-sized phosphors synthesized by ultrasound assisted sol-gel method  

作　　者：Lyes Lamiri Badis Kahouadji Mourad Berd Abdelmoumen Abdellatif Lotfi Benchallal Lakhdar Guerbous Salim Ouhenia Abdelhafid Souici Leila Amiour Abdelhalim Zoukel Madani Samah 

机构地区：[1]Department of TCSN,University of Bejaia,Bejaia,06000,Algeria [2]Department of Technology,University of Bejaia,Bejaia,06000,Algeria [3]Department of Technology,Laboratory of LECVE,University of Bejaia,Bejaia,O6000,Algeria [4]Department of Physics of Materials,University of Science and Technology Houari Boumediene,Algiers,Algeria [5]Laser Department/Nuclear Research Center of Algiers(CRNA),02,Boulevard Frantz Fanon,B.P.399,Algiers,16000,Algeria [6]Laboratory of Physical-chemistry,University of Bejaia,Bejaia,06000,Algeria [7]Phase Transformation Laboratory,Universite Freres Mentouri Constantine 1,Algeria [8]Laboratory Physico-Chemistry of Materials,Laghouat University,Technical Platform of Physico-Chemical Analysis(PTAPC-Laghouat-CRAPC),Laghouat,Algeria

出　　处：《Journal of Rare Earths》2023年第1期51-59,共9页稀土学报（英文版）

基　　金：supported by Nuclear Research Center of Algiers(CRNA),Department of Laser,Luminescence Laboratory。

摘　　要：Nanosized 1 at% Sm^(3+)doped Y_(2)O_(3)powders were prepared by an ultrasound assisted sol-gel method.Y_(2)O_(3):Sm^(3+)powders crystallize in Y_(2)O_(3)pure cubic phase and XRD analysis shows that the as-used agitation protocol affects strongly the crystallite’s shape and mean size.The recorded emission spectra under λ_(em)=600 nm exhibit two absorption bands;the first one is assigned to O^(2-)→Sm^(3+)charge transfer state(CTS) with a maximum absorption at 223 nm,and the second is due to intraconfigurational transition 4f^(5)-4f^(5) of Sm^(3+) with a maximum absorption at 407 nm.The 223 and 407 nm transitions are attributed to characteristics intra-configurational transitions of Sm^(3+).All emission spectra are dominated by reddish/orange luminescence located at 606 nm and assigned to ^(4)G_(5/2)→^(6)H_(7/2) transition.It is found that the photoluminescence intensity of samples obtained under excitation at 407 nm is 60 times smaller than that obtained under 223 nm excitation.Decay time measurements of the ^(4)G_(5/2)→^(6)H_(7/2) luminescence transition indicate that decay time of nano-sized powder is significantly shorter than bulk material one.

关 键 词：Y_(2)O_(3):Sm^(3+)nano-sized powder Sol-gel method ULTRASOUND Charge transfer PHOTOLUMINESCENCE Rare earths 

分 类 号：TQ422[化学工程]